docs: def filter_create(self, phrase, context, irreversible = False, whole_word = True, expires_in = None):
          """
          Creates a new keyword filter. `phrase` is the phrase that should be
          filtered out, `context` specifies from where to filter the keywords.
          Valid contexts are 'home', 'notifications', 'public' and 'thread'.
          
          Set `irreversible` to True if you want the filter to just delete statuses
          server side. This works only for the 'home' and 'notifications' contexts.
          
          Set `whole_word` to False if you want to allow filter matches to
          start or end within a word, not only at word boundaries.
          
          Set `expires_in` to specify for how many seconds the filter should be
          kept around.
          
          Returns the `filter dict`_ of the newly created filter. 
          """
          params = self.__generate_params(locals())
          
          for context_val in context:
              if not context_val in ['home', 'notifications', 'public', 'thread']:
                  raise MastodonIllegalArgumentError('Invalid filter context.')
          
          return self.__api_request('POST', '/api/v1/filters', params)